condition mean min max ZT0-3 38.77936666666667 31.73995 43.5519 ZT4-7 14.88465 14.88465 14.88465 ZT8-11 9.366150000000001 9.366150000000001 9.366150000000001 ZT12-15 34.886225 27.01635 42.7561 ZT16-19 30.1582 30.1582 30.1582 ZT20-23 54.6026 54.6026 54.6026